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Consolidated Statements Of Comprehensive Income (Parenthetical) (Class A Ordinary Shares)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Class A Ordinary Shares
Number of American depositary shares ("ADSs") representing one Class A ordinary share	10	10	10

X

- Definition

The number of American depositary shares ("ADSs") representing one share.

+ References

No definition available.

+ Details

Name:	bidu_AmericanDepositorySharesToSharesRatio
Namespace Prefix:	bidu_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration